let a = '123'
let b = 123

// console.log(a == b); //true

// console.log(a === b);// false;

console.log(Boolean(null)); // false
console.log(Boolean(undefined)); // false
console.log((Boolean(-0))); //false
console.log(Boolean('')); //false


console.log(Number('')); //0
console.log(Number('hello'));//NAN
console.log(typeof (NAN));

console.log(String(-0));//0
console.log(String(+0));//0











